Eye-testing apparatus



March 22, 1927.-

T. J. ARN ESON I EYE- TESTING APPARATUS Original Filed Jam 26. 1925 w mxATTORNEY Patented Mar. 22, 192?.

barren stares PATENT GEE-ICE.

THEODORE J. ABNESON, F BAKER, OREGDN.

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Application filled January 26, 1925, Serial No. 4,898. RenewedSeptember's, 1926.

vision of peculiar and advantageous meansp for rotating the said chart.

Another object is the provision of an eye testing apparatus designedespecially for use in a small room divided by a panel or parti 'tioninto a compartment for the testing of eyes and a compartment for lenslaboratory purposes; the door between the compartments being equippedwith a mirror, and the apparatus being mounted on a chair for readyadjustment so as to always test at the same angle for short and tallpatients.

To the attainment of the foregoing, the invention consists in theimprovement as hereinafter described and definitely claimed.

In the accompanying drawings forming part of this specification Figure 1is a view showing an ophthalmic chair in. side elevation and in properrelation to the mirror comprised in my apparatus, the said mirror inaccordance with one part of my invention being carried by the doorbetween the compartment referred to.

Fi re 2 is a front elevation illustrative of the chair and itsequipment.

Figures 3 and 4 are enlarged detail views illustrative of the motorwhich I prefer to employ for the rotation of m novel chart forexercising the extrinsic com ar muscles.

Figure 5 is a face view of another chart that can be used on the drivenshaft of the motor in lieu of my novel chart.

Figure 6 is an edge elevation of the chart shown in Figure 4.

Figure 7 is a view showing the reverse side of the said chart. v

Fi "re 8 is aview of the chart having the red ct ofi the center thereofand adapted to be used in lieu of my novel chart withE and red dotcombined. l

Similar numerals of reference designate corresponding parts in all ofthe views of the drawings.

Among other elements my novel apparatus comprises a mirror 1. Thismirror 1 in the present and preferred embodiment of the invention iscarried by a door 2 which may be and preferably is the door betweencom-- partments in a small room.

Arranged opposite the mirror 1 and also comprised in my novel'apparatusis a chair 3 which chair ma be of any appropriate type for ophthalmmpurposes. I prefer for the chem 3 to comprise a back 4 adapted to beconvertible from a back to a childs seat and vice versa. This feature ofthe chair, however, is not of my. invention, and hence I would have itunderstood that the said element t may be altogether omitted withoutaffecting my invention as claimed.

In accordance with my invention I assomate with the back 5 of thechairan upright member 6 by which is carriedtestim equipment generallydesignated by 7, the theory of my invention contemplating the patient inthe chair looking'into the mirror and seeing v the testing means 7. Theupright member 6 is adjustably connected at 8 to the back 5 by themeans; illustrated or by any other means approprlate to my invention insuch manner that the member 6 can be quickly and easily adjusted in averticaldirection relative to the back 5 and adjustably fixed withrespect to the back 5, this provision being important inasmuch as itadapts the apparatus for testing at the same angle the.

eyes of short and tall-patients seated in the chair. A portable mirroris also used close up in front of the patientior straightening difficultcases of cross eyes.

An essential and highly importantpart of the testing apparatus referredto is a chart or disk 9 which is of my invention, the said chart or disk9 being adapted to be rotated at a variable rate of speed and beingcharac- 9c when rotated is adapted to very efiectiv'ely hold theattention of a patient, and it is also adapted to be used to advantagein a well lighted room as distinguished from the old practice in whichpatients are treated in a dark room with the assistance of only a smallsteady light. As illustrated the chart or disk 9 is arranged in front ofa, letter chart 12 and a casing 13, said chart and casing beingconnected with and adjustable on a chair'back 5 when the upright member6 is adjusted. Also connected with the upright member 6 is anincandescent electric lamp ld'disposed in a shade 15, the current forthe said lamp being controlled by a switlcg 16, Figure 3, carried by thesaid cas- H10 For the purpose of rotating the chart or dlsk 9 about itsaxis I employ by preference the motor shown in Figures 3 and 4, thedrive shaft of which is designated by 17, I prefer in practice toremovabl arrange the chart 9 on the driven shaft 1% so that the saidchart may be removed when desired to give place to charts such as shownin Figures 5 to 8. The motor alluded to includes a rotary casing 18 anddesi ed to contain a spring (not shown), a sha 19 having a gear 20 inmesh with a gear 21 on the casing 18, a shaft 22 rotatable by the springof the casing. 18, said spring being tensioned by rotation of the casing18, a gear 23 on the shaft 19 and meshed with a gear 24 on the drivenshaft 17, a spur ear 25 on the shaft 17, a shaft 26 having av isk 27 andalso having a pinion 28 meshed with a spur gear 25, a stop or brake 29adjustable in the casing 13 and adapted for cooperation with the disk27, a drum 30 on the shaft 19, and a cable 3Iconnected to and adapted tobe wound on the drum 30 and also adapted to be drawn off the drum 30with a viewto winding or putting under tension the spring referred to.Manifestl when the spring of the motor is put un er tension,disengagement of i the stop or brake 29 from the disk 27 will preferredembodiment of my invention in order to impart a full, clear and exactunderstanding of the said'embodiment. I do not desire, however, to beunderstood as confining myself to the specific construction and relativearrangement of parts inasmuch as in the future practice of the inventionvarious changes and modifications may be made such as fall within thescope of my inven- 'tion as defined by my appended claim.

Having described my invention, what I claim and desire to secure byLetters-Patent, 1s

In eye testing apparatus, the combination of supporting means, a motoron saidsupporting means, and a disk mounted for con.- tinuous. rotationby the motor and having on its face an eccentric red dot and a coloredl'ctter E, with a chair on which the testin apparatus is supported andrelative to whic the testing apparatus is-adjustable, and the apparatusbeing arranged to be observed with the aid of a mirror by a patientseated in the chair.

In testimony whereof I afiix my signature.

THEODORE J. ARNESON.

